Hydraulic spray pump



March 25, 1953 D. H. ANDERSON ET AL 3,082,917

HYDRAULIC SPRAY PUMP 3 Sheets-Sheet 1 Filed Oct. 9, 1959 .mns

March 26, 1963 D. H. ANDERSON ET AL 3,082,917

HYDRAULIC SPRAY PUMP Filed Oct. 9, 1959 l WM March 26, 1963 D. H.ANDERSON ET Ax. 3,082,917

HYDRAULIC SPRAY PUMP 5 Sheets-Sheet 5 Filed 0G13. 9, 1959 I r11/'enf orgDafzad Jn denso 11.

3,082,917 HYDRAULIC SPRAY PUMP Donald H. Anderson, New Lenox, and WalterR. Peterson, Plainfield, Ill., assignors to H. D. Hudson ManufacturingCompany, Chicago, Ill., a corporation of Minnesota Filed Get. 9, 1959,Ser. No. 845,367 2 Claims. (Cl. 222-243) tes arent and extendibleshafts, belt driven by the power-take-otl i shaft or belt pulley, ormounted directly on the powertake-off shaft of the tractor.

All of these prior forms of drive means have inherent d-isadvantages ashereinafter pointed out. Belt drives are cumbersome and difcult tomaintain in proper tension, while universal joints have a limit inturning radius under full load. Direct power-take-off mounted pumps ofthe piston type are limited tospeeds of `approximately 540 rpm. so thatthe more recent tractors having a powertake-ott speed of approximately`100i) r.p.m. make direct mounted piston pumps obsolete or impracticalfor the purpose of operating a spray pump.

Furthermore, piston-type pumps, whether power-takeoi or engine driven,have a pulsation characteristic in direct relation to the speed anddisplacement per stroke. This pulsation is produced when the circularmotion of the drive is translated into the horizontal or linear motion'of the piston. These and other disadvantages of Iand objections totheprior types of tractor-operated spray mechanisms have been eliminatedin the present novel assembly, in which the pump is operated without anyconnection to or engagement with the power-take-of shaft of the tractor.v

3,082,9l7 Patented Mar. 26,1963

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Another important object of the present invention is the provision Iof anovel hydraulically-actuated spray pumping -system embodying a pair ofaligned cylinders each having a plunger or piston actuated by a commonreciprocating plunger shaft, one of said cylinders providing an oilcylinder connected to the hydraulic system and the other providing aspray cylinder for continuously supplying spray solution under pressureto a spray boom or spray gun with the volume of dispensed spray solutionbeing readily -adju-stable to the capacity of the hydraulic system by amere change in the ratio in effective area between the two alignedcylinders. i

Another object of the present invention is the provision of a novelhydraulically-actuated piston pump, either tractor or engine driven,having a reciprocating pump plunger and an agitator on the end of saidplunger in the spray supply tank for continuously agitating the spraysolution and maintaining the mixture in uniform suspension.

Further objects are to provide a construction of maximum simplicity,efficiency, economy and ease of assembly Another important object of thepresent invention is j to provide a novel hydraulically-actuated spraypump in which the pulsation characteristic of the belt drivenior shaftdriven piston pump is eliminated due to the fact that the speed oftravel and the displacement per inch of travel is maintained uniform inboth directions of travel. In this novel assembly when operated from thehydraulic system of a tractor, the only connections between the tractorand the pump are the oil line hoses connecting the tractor hydraulicsystem to the driving cylinder of the pump, whereby the tractor may beturned at any angle from the sprayer under full load and continuousoperation.

While the present invention is disclosed as operated from the hydraulicsystem of la tractor, its novelty is not limited thereto but residesbroadly in a novel means whereby the energy present in any hydraulicsystem can be readily converted by the provision of a driving chamber, aspray liquid chamber, an actuating valve mechanism and a tripping andreversing mechanism all combining and operating -in a novel manner todispense or discharge the spray liquid under pressure. I

The present invention further comprehends a novel hydraulically-actuatedspray pump assembly having a hydraulically-actuated plunger in a drivecylinder, a spray plunger in a driven cylinder, a shuttle valve, atripping and reversing mechanism for actuating the shuttle valve ,tocontrolmovement of the hydraulically-actuated plunger of the drivecylinder, and a plunger shaft having means for simultaneouslyreciprocating both plungers and operating the tripping and reversingmechanism which in turn controls the shuttle valve and drive plunger.

and operation, Iand such further objects, advantages and capabilities aswill later more fully appear and are inherently possessed thereby.

In the drawings:

FIGURE 1 is a top plan view of the novel spray pump assembly and thespray tank. v

FIG. Z is a View, part in horizontal cross section and partin sideelevatiomthe section being taken approximately on the longitudinal line2--2 of FIG. l and viewed in the direction of the arrows, and includingall-but the shuttle valve assemblywhich is shown in side elevation.

FIG.- 3 is a view in vertical cross section taken approximately on theline 3.-'3` of FIG. 2 and viewed in the direction of the arrows. l

` FIGQ`4 is a diagrammatic View in horizontal cross section 4through theshuttle valve and drive cylinder, the view showing the position of theshuttle valve, the drive piston and the flow of the hydraulic fluid to`and from the drive cylinder for moving the drive piston to Aadjacentone end of its cylinder.

FIG. 5 is a view similar -to FIG. 4 but showing the Vshuttle valve 4anddrive piston moved to a substantially centered position.

`FIG. 6 is a view similar to FIG. 4 but showing the shuttle valve withthe drive piston reversed and moved to adjacent the other end of thedrive cylinder.

Referring lmore particularly to the disclosure in the drawings in whichis shown an illustrative embodiment of the novel spray pump assemblyoperated from the hydraulic oil system of ya tractor, the oil orhydraulic fluid for actuating the pump is supplied .under pressure froma supply tank 10i which may be an oil reservoir or the crank case of thetractor hydraulic system, but separate `trom the tractor engine. The`oil is pumped rfrom the tank 10' of the tractor hydraulic systemVthrough a supply line lll to the tractor pump P and from the tractorpump through a communica-ting pressure line l2 -to a shuttle valveassembly 13, from where the oil under pressure is supplied turn lineldit; are preferably oil line hoses ttor passage of the hydraulic iluid.Y v

The housing 15 is provided with a longitudinal cylinmovement a shuttlevalve 21 having a valve stem or plunger rod 22 provided with threespaced and solid spools 23, 24 and 25, each conformably received andmovable with the stem in the bore 1-9, the intermediate spool 24 beinguniformly spaced from the end spools 23 and 25 and with the outer end ofeach of these end spools provided with an annular groove receiving anO-ring 26 for effectively sealing against leakage therebeyond of thehydraulic fluid. This shuttle valve is automatically actuated bytripping and reversing mechanism in a manner as hereinafter explained.

In the housing 15 and communicating with the bore -19 are spaced ports27 and 28 at one side of the valve and spaced ports y29 and 31 at theother side, th'e end ports 27 and -31 opening into a common passage 32communicating with the return line 18. The port 28j communicates with anoil line 33 opening into a port 34 preferably as shown in IFIG. 2 in oneend wall 35 of a driving cylinder 36 of the Y hydraulically driven fluidpump assembly 14, and the port 29 communicates with an oil line 37opening into a port 38 preferably in the other end wall 39 of thedriving cylinder. ln the end walls 35 and 39 of this drivng cylinder 36is concentrically mounted one end of a sectional plunger shaft 41, -theshaft projecting through a frame 42 and its other end projecting throughthe end walls or closures 43 and 44 of an encompassing spray cylinder45. On the extreme end 46 of this shaft is mounted a plate agitator 47by means of suitable attaching means such as a lock nut and washer 48,the spray cylinder and the agitator being preferably submerged in thespray solution contained in a supply tank 49.

The plunger shaft 441 is shown formed of multiple sections and on theconnected sections within the driving cylinder 36 is a plunger l51comprising opposed cup leathers 52 and S3 separated by a spacer 54 andeach member 52 and 53 being retained fin operative position by a collar55 threaded onto a reduced threaded connection 56 of the plunger shaft.A similar plunger 51B having cup leathers x52 `and 53 a spacer `54 andcollars 55, is mounted and retained on a reduced threaded connection 57of the section of the plunger shaft 41 concentrically mounted within thespray cylinder 45.

The portion of the plunger shaft 41 between the end plates `58 and 59 ofthe frame 42, is also divided at 61 with the adjacent ends threaded andreceived within a connecting sleeve 62 having an outwardly projectingcollar or annular ange '63 movable longitudinally with the reciprocatingplunger shaft 41. A guide bar 64 extends parallel yto but in spacedrelation with the plunger shaft 41 with its ends mounted in the endplates 58 and 59 of the frame 42, these end plates being joined by bolts60 to the adjoining end walls 39 and 43 of the cylinders 36 and 45. On.this guide 4bar is slidably mounted an elongated sleeve 65 havingspaced collars 66 and 67 each anchored tothe sleeve by means of a setscrew or other attaching means 68.

'Ihe sleeve 65 intermediate its collars is provided with an upstandingrib or fin `69 having an opening for receiving and connecting theretothe lower end of a centered coil or contractile spring 70 of a trippingand reversing mechanism, with the other end of this spring connected toa depending part 71 at the upper end of an inverted, substantiallyU-shaped lever 72. The spaced arms 73 of this lever are pivotallymounted adjacent their lower end by a bolt or other suitable attachingmeans 74 upon spaced upstanding brackets 75 atl'lxed to the upper anglemembers 76 forming the corners of Ithe rectangular frame 42, and 'theseangle members anchored at their ends upon the end plates 58 and 59 ofthe frame 42. At the exterior of each lever Iarm 73 the frame hasrigidly supported thereon spaced inwardly inclined supports 77 and 78joined by an upper longitudinally extending connecting bar or brace 79,and connecting transverse bars or braces 81 each having an inclinedrubber stop or abutment 82. These spaced stops limit the throw orpivotal movement of the upper 'end of the lever 72.

Each of the spaced 4arms 73 of the lever 72 is provided with spacedopenings 83 one of which is Iadapted to receive the pivotal connection74 and another to receive a bolt or pivotal connection 84 for connectingeach arm 73 to an arm or bifurcation 8S -of a movable link 86, providing.an overeen-ter linkage for the tripping and reversing mechanism. 'I'hearms l85 of 'the link 86 are joined at the forward end and .thereatconnected to the bifurcated end 87 of the shuttle valve stern 22.

The collars 66 and -67 are spaced apart on the sleeve 65 and so disposedas to lbe contacted by the collar 63 on the sleeve 62 of the plungershaft 41 as the latter reciprocates back and forth. Thus as the plungershaft 41 travels to the right, the xed collar 63 contacts the collar 67onV the sleeve 65 and moves the latter on the guide bar 64. When thesleeve 65- travels to the right past the center of the spring 70, whichis connected at the lower end to lthe sleeve 65 and at its upper end tothe lever 72, the latter snaps to the right against the shockabsorbingstop 82 at the right, and moves the link 86 to reverse ythe shuttlevalve 21 whereupon the direction of travel of the plunger shaft 41 andits cylinder plungers 51 and 51a is reversed thereby effecting andmaintaining a continuous operation of the spray pump.

Referring to the spray tank 49 into which projects an end of the plungershaft 4l, the end wall 43 of the spray cylinder 45 is provided with aninlet port l88 and a coupling member 89 providing a valve housing havingan inlet tube 90 depending into the tank 49 to adjacent the bottomthereof for the passage of spray solution from the tank into one end ofthe spray cylinder 45 containing the driven plunger 51a. In thiscoupling member 89 is an inlet check valve 91 controlling the ilow ofthe entering spray solution. The end wall 43 is also provided with anoutlet port 92 communicating with a coupling member 93 providing a valvehousing for a check valve 91 for controlling discharge of the spraysolution. 'I'he opposite end wall 44 is provided with a similar inletport 88a having a coupling member 89a providing a housing for a checkvalve 91 (not shown), and an inlet tube 90a and an outlet port 92acommunicating with a coupling member 93a providing a valve housing for asimilar check valve 91 for controlling discharge Vthrough this outletport, the coupling members communicating with the opposite dischargeports 92 and 922L being joined by a common connection 94 to a commonfeed line 95 from where the spray solution is continuously dischargedfrom one and then the other end of the cylinder 45 as the plunger 51a iscontinuously reciprocated. This discharge or feed line 9S is providedwith a pressure gauge 96 and an air chamber 97 whereby spray solution issupplied continuously to a spray nozzle or spray boom not shown as theplunger 51a is reciprocated.

With the spray pump or cylinder 45 wholly or partially submerged in thespray liquid in the supply tank 49, as the plunger 51a moves to theright (as viewed in FIG. 2) by the reciprocatory movement of the plungershaft 41 actuated by the plunger 51, spray liquid is drawn into thecylinder 45 through the inlet port 88 and past the inlet valve 91.Simultaneously spray liquid is forced out of the cylinder 45 at -theother end by the plunger 51a, 4through the outlet port 92a and past itscheck valve 91 to the spray boom or spray gun through the discharge line95. A pressure control and relief valve 98 regulates the pressure of thedischarge.

This pressure relief valve 93 comprises a housing 99 having a baseprovided with an inlet port 100 communicating with a return hose 101. Inthe housing is a springloaded check and relief valve member 102controlling ow through the inlet port 100, the compression on theexpansible spring 103 which bears against the valve member 102 beingcontrolled by a vertically movable stem 104 bearing at its lower end inthe housing against the upper end of the spring, and a pivoted handle105 having a cam surface 106 bearing against the upper, extended end ofthe stem 104. Any excess liquid under pressure bypassing the reliefvalve member 102 is returned to the supply tank 49 through the returnhose 101.

In FIGS. 4, 5 and 6 the shuttle valve assembly 13, the driving cylinder36 with an end of the plunger shaft 41 and its plunger 51, and the oilsupply reservoir are shown diagrammatically.

While FIG. 2 shows the spray or driven cylinder 45 of a diameter similarto that of the oil or driving cylinder 36, it is to be understood thepresent invention contemplates that the spray cylinder may be of anydiameter necessary to -deliver the required gallonage of spray solutionto the spray boom or spray gun for controlling the ultimate discharge.Thus by varying the ratio in area between the oil cylinder 36 and thespray cylinder 45, the volume of spray solution required may be adjustedto the hydraulic system of the tractor.

Each model of tractor has a given amount of energy available through itshydraulic system. For example, a tractor with a capacity of 7 gallons ofoil per minute at 750 pounds per square inch pressure has 5,250 gallon/pounds of energy available. Thus, if the cylinders 36 and 4S are ofequal diameter, spray cylinder 45 delivers 7 gallons per minute at 750pounds per square inch pressure, not compensating for any friction loss.If the area of spray cylinder 45 is three times the area of cylinder 36,such spray cylinder would deliver 21 gallons per minute at 250 poundspressure, making it evident that the volume of available spray solutioncan be readily adjusted to the capacity of the hydraulic system of thetractor.

By mounting the agitator 47 on the end of the reciprocating plungershaft 41 in the spray tank 49, the spray solution in this tank iscontinuously agitated and kept in uniform suspension.

From the above description and the disclosure in the drawings, it willbe apparent the present invention provides a novel hydraulic spray pumpcomprising a driving or oil cylinder in which the oil under pressure isautomatically supplied to one and then the other end of this cylinder, acommon plunger shaft and a driven or spray cylinder mounted in alignmentand having means for increasing the gallonage or volume output of atractor hydraulic system by a mere change in the areas of saidcylinders.

The present novel spray pump eliminates all connection with thepower-take-off shaft of the tractor, operates without transfer ofcircular or oscillatory to linear motion and eliminates the pulsa-tingcharacteristics of a beltdriven or shaft-driven piston pump, but assuresa continuous pumping operation. It provides a tractor driven spray pumpof positive displacement, without bearings, rotating shafts, pulleys,connecting rods or wrist pins required with prior assemblies.

The present invention rthus provides a novel means and manner ofharnessing the potential energy present in any hydraulic system forcreating a variable spray volume discharge and pressure as desired orrequired in spraying.

laving thus disclosed the invention, we claim:

1. A spray pump operated by the energy lavailable in a hydraulic systemof a tractor, comprising a spray tank containing a spray solution, ahorizontally disposed spray cylinder extending into the spray tank withits opposite ends communicating with the contents of the spray tank, aseparate horizontally disposed driving cylinder spaced yfrom said spraytank, a supporting frame between said tank and said driving cylinder, acommon, continuously operating plunger shaft mounted in horizontalalignment with and for reciprocation in both said cylinders, a piston onsaid shaft within each of said cylinders with both pistonssimultaneously reciprocated by said plunger shaft, agitating means insaid tank actuated Iby said shaft for agitating the spray solution inthe tank and maintain-ing any solids in suspension as said shaft isreciprocated, separate inlet ports and separate outlet ports at each endof said spray cylinder, inlet tubes communicating with said inlet portsand depending to adjacent the -bottom of said tank for withdrawing spraysolution therefrom, nonreturn valves in eac-h inlet and outlet port, acommon conduit connecting said outlet ports, a discharge linecommunicating with said common conduit, a reciprocating shuttle valvemounted -on said supporting frame and controlling the flow 0f oil fromthe hydraulic system of the tractor to said driving cylinder, and atripping and reversing mechanism for said shuttle valve on saidsupporting frame including a collar on said common shaft, a fixed guidebar mounted in said supporting frame and extending parallel to thecommon shaft and provided with 'a sliding sleeve, spaced collars on thesleeve with one of said collars disposed at each side of the collar onthe common shaft, said collar on said shaft contacting one 0f saidcollars on said sleeve as the shaft nears the extent of travel in onedirection and contacting the other of said spaced collars as the shaftnears the extent of travel in the opposite direction, upstandingsupports on said supporting frame having transversely extending stopbars, an upwardly extending lever pivotally mounted adjacent its lowerend on said supporting frame and having its upper free end movable in anarc between said stop bars, a contractile spring connected to said leveradjacent its upper end and connected at its opposite end to saidslidable sleeve, and a link connected at one end to said leverintermediate its pivot and its upper end and at its other end to saidreciprocable shuttle valve so that upon engagement of said common shaftcollar with one of said spaced collars said sleeve is moved to trip thelever and reverse the shuttle valve.

2. A lspray pump operated by the energy available in a hydraulic systemof a tractor as set forth in claim l, in which a pressure relief valvecommunicates with `said common conduit, said relief valve including ahousing, a spring-loaded Valve member normally seated within saidhousing, a pivoted manually actuated cam member controlling pressureexerted on said springloaded valve member, and a return conduitcommunieating with said housing above said valve member and with saidspray tank.

References Cited in the le of this patent UNITED STATES PATENTS 116,572Doyle July 1871 417,961 White Dec. 24, 1889 421,159 Broun Feb. 11, 18901,025,222 Wallace May 7, 1912 1,768,799 Stanley July 5, 1928 1,953,222Gordon Apr. 3, 1934 2,460,004 Green et al. Jan. 25, 1949

1. A SPRAY PUMP OPERATED BY THE ENERGY AVAILABLE IN A HYDRAULIC SYSTEMOF A TRACTOR, COMPRISING A SPRAY TANK CONTAINING A SPRAY SOLUTION, AHORIZONTALLY DISPOSED SPRAY CYLINDER EXTENDING INTO THE SPRAY TANK WITHITS OPPOSITE ENDS COMMUNICATING WITH THE CONTENTS OF THE SPRAY TANK, ASEPARATE HORIZONTALLY DISPOSED DRIVING CYLINDER SPACED FROM SAID SPRAYTANK, A SUPPORTING FRAME BETWEEN SAID TANK AND SAID DRIVING CYLINDER, ACOMMON, CONTINUOUSLY OPERATING PLUNGER SHAFT MOUNTED IN HORIZONTALALIGNMENT WITH AND FOR RECIPROCATION IN BOTH SAID CYLINDERS, A PISTON ONSAID SHAFT WITHIN EACH OF SAID CYLINDERS WITH BOTH PISTONSSIMULTANEOUSLY RECIPROCATED BY SAID PLUNGER SHAFT, AGITATING MEANS INSAID TANK ACTUATED BY SAID SHAFT FOR AGITATING THE SPRAY SOLUTION IN THETANK AND MAINTAINING ANY SOLIDS IN SUSPENSION AS SAID SHAFT ISRECIPROCATED, SEPARATE INLET PORTS AND SEPARATE OUTLET PORTS AT EACH ENDOF SAID SPRAY CYLINDER, INLET TUBES COMMUNICATING WITH SAID INLET PORTSAND DEPENDING TO ADJACENT THE BOTTOM OF SAID TANK FOR WITHDRAWING SPRAYSOLUTION THEREFROM, NONRETURN VALVES IN EACH INLET AND OUTLET PORT, ACOMMON CONDUIT CONNECTING SAID OUTLET PORTS, A DISCHARGE LINECOMMUNICATING WITH SAID COMMON CONDUIT, A RECIPROCATING SHUTTLE VALVEMOUNTED ON SAID SUPPORTING FRAME AND CONTROLLING THE FLOW OF OIL FROMTHE HYDRAULIC SYSTEM OF THE TRACTOR TO SAID DRIVING CYLINDER, AND ATRIPPING AND REVERSING MECHANISM FOR SAID SHUTTLE VALVE ON SAIDSUPPORTING FRAME INCLUDING A COLLAR ON SAID COMMON SHAFT, A FIXED GUIDEBAR MOUNTED IN SAID SUPPORTING FRAME AND EXTENDING PARALLEL TO THECOMMON SHAFT AND PROVIDED WITH A SLIDING SLEEVE, SPACED COLLARS ON THESLEEVE WITH ONE OF SAID COLLARS DISPOSED AT EACH SIDE OF THE COLLAR ONTHE COMMON SHAFT, SAID COLLAR ON SAID SHAFT CONTACTING ONE OF SAIDCOLLARS ON SAID SLEEVE AS THE SHAFT NEARS THE EXTENT OF TRAVEL IN ONEDIRECTION AND CONTACTING THE OTHER OF SAID SPACED COLLARS AS THE SHAFTNEARS THE EXTENT OF TRAVEL IN THE OPPOSITE DIRECTION, UPSTANDINGSUPPORTS ON SAID SUPPORTING FRAME HAVING TRANSVERSELY EXTENDING STOPBARS, AN UPWARDLY EXTENDING LEVER PIVOTALLY MOUNTED ADJACENT ITS LOWEREND ON SAID SUPPORTING FRAME AND HAVING ITS UPPER FREE END MOVABLE IN ANARC BETWEEN SAID STOP BARS, A CONTRACTILE SPRING CONNECTED TO SAID LEVERADJACENT ITS UPPER END AND CONNECTED AT ITS OPPOSITE END TO SAIDSLIDABLE SLEEVE, AND A LINK CONNECTED AT ONE END TO SAID LEVERINTERMEDIATE ITS PIVOT AND ITS UPPER END AND AT ITS OTHER END TO SAIDRECIPROCABLE SHUTTLE VALVE SO THAT UPON ENGAGEMENT OF SAID COMMON SHAFTCOLLAR WITH ONE OF SAID SPACED COLLARS SAID SLEEVE IS MOVED TO TRIP THELEVER AND REVERSE THE SHUTTLE VALVE.